text:  /*
   * libwebsockets - small server side websockets and web server implementation
   *
   * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to
   * deal in the Software without restriction, including without limitation the
   * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   * sell copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   * IN THE SOFTWARE.
   *
   *  lws_genec provides an EC abstraction api in lws that works the
   *  same whether you are using openssl or mbedtls crypto functions underneath.
   */
  #include "private-lib-core.h"
  
  const struct lws_ec_curves *
  lws_genec_curve(const struct lws_ec_curves *table, const char *name)
  {
  	const struct lws_ec_curves *c = lws_ec_curves;
  
  	if (table)
  		c = table;
  
  	while (c->name) {
  		if (!strcmp(name, c->name))
  			return c;
  		c++;
  	}
  
  	return NULL;
  }
  
  //extern const struct lws_ec_curves *lws_ec_curves;
  
  int
  lws_genec_confirm_curve_allowed_by_tls_id(const char *allowed, int id,
  					  struct lws_jwk *jwk)
  {
  	struct lws_tokenize ts;
  	lws_tokenize_elem e;
  	int n, len;
  
  	lws_tokenize_init(&ts, allowed, LWS_TOKENIZE_F_COMMA_SEP_LIST |
  				       LWS_TOKENIZE_F_MINUS_NONTERM);
  	ts.len = strlen(allowed);
  	do {
  		e = lws_tokenize(&ts);
  		switch (e) {
  		case LWS_TOKZE_TOKEN:
  			n = 0;
  			while (lws_ec_curves[n].name) {
  				if (id != lws_ec_curves[n].tls_lib_nid) {
  					n++;
  					continue;
  				}
  				lwsl_info("match curve %s\n",
  					  lws_ec_curves[n].name);
  				len = strlen(lws_ec_curves[n].name);
  				jwk->e[LWS_GENCRYPTO_EC_KEYEL_CRV].len = len;
  				jwk->e[LWS_GENCRYPTO_EC_KEYEL_CRV].buf =
  						lws_malloc(len + 1, "cert crv");
  				if (!jwk->e[LWS_GENCRYPTO_EC_KEYEL_CRV].buf) {
  					lwsl_err("%s: OOM\n", __func__);
  					return 1;
  				}
  				memcpy(jwk->e[LWS_GENCRYPTO_EC_KEYEL_CRV].buf,
  				       lws_ec_curves[n].name, len + 1);
  				return 0;
  			}
  			break;
  
  		case LWS_TOKZE_DELIMITER:
  			break;
  
  		default: /* includes ENDED */
  			lwsl_err("%s: malformed or curve name in list\n",
  				 __func__);
  
  			return -1;
  		}
  	} while (e > 0);
  
  	lwsl_err("%s: unsupported curve group nid %d\n", __func__, n);
  
  	return -1;
  }
  
  LWS_VISIBLE void
  lws_genec_destroy_elements(struct lws_gencrypto_keyelem *el)
  {
  	int n;
  
  	for (n = 0; n < LWS_GENCRYPTO_EC_KEYEL_COUNT; n++)
  		if (el[n].buf)
  			lws_free_set_NULL(el[n].buf);
  }
  
  static const char *enames[] = { "crv", "x", "d", "y" };
  
  LWS_VISIBLE int
  lws_genec_dump(struct lws_gencrypto_keyelem *el)
  {
  	int n;
  
  	(void)enames;
  
  	lwsl_info("  genec %p: crv: '%s'\n", el,
  		  !!el[LWS_GENCRYPTO_EC_KEYEL_CRV].buf ?
  		  (char *)el[LWS_GENCRYPTO_EC_KEYEL_CRV].buf: "no curve name");
  
  	for (n = LWS_GENCRYPTO_EC_KEYEL_X; n < LWS_GENCRYPTO_EC_KEYEL_COUNT;
  	     n++) {
  		lwsl_info("  e: %s\n", enames[n]);
  		lwsl_hexdump_info(el[n].buf, el[n].len);
  	}
  
  	lwsl_info("\n");
  
  	return 0;
  }
  